High School Musical reunion! Vanessa Hudgens, Ashley Tisdale and the gang team up for 10-year anniversary... but Zac Efron skips it

The cast of High School Musical have reunited 10 years after the tween sensation first aired.

Actors Vanessa Hudgens, Ashley Tisdale, Lucas Grabeel, Corbin Bleu and Monique Coleman sat down to reminisce about their time on the smash Disney TV movie on Sunday as they taped a special for a 10-year anniversary broadcast.

But HSM's breakout star Zac Efron did not attend the taping for the special, which will air on The Disney Channel on January 20.

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Time flies: High School Musical cast members, from left, Corbin Blue, Monique Coleman, Vanessa Hudgens, Lucas Grabeel and Ashley Tisdale sat down to relive their HSM memories for a 10-year anniversary special

Instead, the 28-year-old will appear in a pre-taped message to High School Musical fans that will air during the anniversary broadcast.

Zac, who has worked hard to shed his teen heartthrob image over the years, has been busy filming the sequel to Neighbors as well as upcoming comedy Dirty Grandpa, and has signed on for the new Baywatch movie.

But the rest of the cast were obviously excited to be reunited on Sunday, sharing their photos from the Wildcats 'gym' on Twitter as they sat down to share their fond memories of filming.

Tween sensation: The original High School Musical was a huge hit for Disney, with 100 million people watching the movie the first year it was released

'Oh the feels,' wrote Ashley Tisdale as she shared a photo of the Wildcats gym and a cast selfie.

'Get ready because we're back celebrating 10th anniversary.'

And she shared a photo of the smiling cast members, captioning it '#Wildcats rawr.'

Wildcats are back! Ashley Tisdale shared a cast selfie from the set on Sunday. From left, Monique Coleman, Corbin Blue, Ashley, Vanessa Hudgens and Lucas Grabeel

Ready for their close up: Lucas also shared a photo of Monique, Vanessa and Ashley from the set on Sunday

Actor Corbin Blue also took to social media to share his excitement.

'Spent the morning reliving great memories!' he tweeted.

And actor Lucas Grabeel also shared a photo from filming on Sunday, writing 'What a crazy morning! Hanging after 10 years.'

'Wear our #HSM class rings to celebrate the 10th anniversary,' Lucas captioned a photo of himself and Corbin smiling as they flashed their gold and ruby rings.

Memories: The cast members appeared thrilled to be reunited, sharing photos on social media on Sunday

Loyalty: Lucas Grabeel tweeted a photo of himself and costar Corbin Blue wearing their 'class rings' on set

Smash hit: The Disney movie spawned two sequels and a touring production

The film launched the careers of Zac Efron, Vanessa Hudgens and Ashley Tisdale.

Zac and Vanessa also dated for four years after meeting on set, before breaking up in 2010.

The movie follows the adventures of jock Troy (played by Zac) and nerdy new girl Gabriella (played by Vanessa), who throw the school's social order into chaos when they decide to follow their love of singing and try out for the school musical.

The way he was: Star Zac Efron, seen in Hollywood in August, and in High School Musical in 2006. The Disney TV movie launched the hearthtrob's career

Just wants to sing: Zac did not attend Sunday's anniversary taping, but has recorded a message to HSM fans that will air during the 10-year anniversary broadcast

Disney President and Chief Creative Officer Gary Marsh said seeing the cast back together was a reminder of why the movie connected with audiences.

'It's their optimism, their dedication and their extraordinary talent as a group that made this such an exceptional movie and cultural phenomenon,' said Mr Marsh.

'Ten years later, the movie continues to delight audiences around the globe, not just for its memorable song and dance numbers, but for its universal themes that continue to resonate with fans everywhere - express yourself, believe in yourself and always follow your dreams.'

Ready for the spotlight: HSM followed the adventures of a jock, played by Zac, and a nerdy new girl, played by Vanessa, who upset their school's social hierarchy by following their passion for music

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High School Musical reunion includes Vanessa Hudgens but not Zac Efron